Ok mine measures 70mm from the back of the channel to the start of the radius and 175mm wide at its widest point near the tail.
Bunnings have a jigsaw for $30 odd and a the glue for under $10, you will also need some masking tape.

Thanks for info I'll post some pics once it's done. Before I found your thread I had been searching on google trying to find info on doing this and I didn't find anything , so thanks again for posting it up.

ETM this afternoon I was offered this old board for free, so I'll going to hold off from cutting my board up at this stage. I want try this one out first and see how it goes. I might still do the mod at later stage.